[TeMPOraL]

Like with other "90% of X is wasted" sayings, you don't know which 90% it is.

Even if you look at classical art with an honest eye, you can find plenty of works that in themselves are, well, crap - but they're being preserved and reproduced and talked about, because they acquired meaning over time. They've become relevant in context.

Take your old Twitter account. It's probably not interesting. It probably won't ever be. But it might. Imagine several decades from now, your great-granddaughter becomes a well-known, influential politician. This might retroactively and posthumously make you relevant, and in the process your Twitter account. Biographists might find it useful. Or independently, people who're into historical train schedules. Etc.

It's near-impossible to predict what the future will find relevant, so if storing some memories is nearly free on the margin - as it is today, with digital technologies - then just storing it is a no-brainer.